JPH0199059A - Electrophotographic photoreceptor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an electrophotographic photoreceptor.

[Conventional technology]

Electrophotographic photoreceptors are made of inorganic photoconductive materials such as zinc oxide, cadmium sulfide, selenium, selenium-tellurium alloy, and hydrogenated amorphous silicon, or grown materials such as polyvinylcarbazole-trinitrofluorenone charge transfer complexes, dyes, and pigments. There are two types of organic photoconductive materials. however,
"Organic photoconductive materials have the advantage of being harmless and inexpensive, but the printing durability of the surface is poorer than that of inorganic photoconductive materials. Therefore, on the surface of organic photoconductive materials, There have been reports of attempts to improve printing durability by overcoating with thermosetting substances such as organosilicate.
-51155) [Problems to be solved by the invention] However, although these overcoats improve printing durability, increasing the thickness of the overcoat in order to increase printing durability reduces the surface insulation. There was a problem that it became difficult for electric charges to escape from the surface.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an excellent electrophotographic photoreceptor with improved printing durability in which residual charges are less likely to accumulate on the surface.

[Means for solving problems]

The electrophotographic photoreceptor of the present invention is an electrophotographic photoreceptor comprising a conductive layer, a photoconductive layer, and a surface layer laminated on a support. It is characterized by being composed of a structure in which a substance or a charge transporting substance is dispersed.

The charge transport substance of the present invention is a substance that has a function of transporting electrons or holes, such as an electron-accepting substance or an electron-donating substance.

[For production]

According to the above configuration of the present invention, since most of the surface layer of the photoreceptor is made of organosilane thermosetting resin, it has hardness similar to glass, and printing durability is improved. Residual charge build-up is also removed by conductive or charge transporting materials uniformly distributed in the surface layer.

〔Example〕

[Example 1] FIG. 1 shows an example of an electrophotographic photoreceptor according to an example of the present invention. 1 is a support and a conductive layer, 2 is a photoreceptor layer, 3 is a surface layer, 4 is a thermosetting resin, and 5 is a conductive substance or a charge transport substance.

On an aluminum support, CdS powder activated with Cu and sensitized with In and polymethacrylic acid resin were deposited at 100%
: A photoconductive layer was formed by mixing at a weight ratio of 7. Further, an acidic catalyst such as H'CI is added to a mixed solution of a co-hydrolyzed solution of methyltrimethoxysilane and tetraethoxysilane and Tidy at a composition ratio of 8:2, and a 0.0-. A surface layer with a thickness of 5 μm was attached, and the photoreceptor 1 was prepared by holding the surface layer at 100° C. for 30 minutes to cure it.

[Comparative Example 1] An electrophotographic photoreceptor was prepared in the same manner as in Example 1 except that T i O2 was not added when forming the surface layer.

Connect this to photoreceptor 1'.

Further, a photoreceptor 1'' was prepared in the same manner as in Example 1 except that the surface layer was not formed.

[Example 2] CTC236, a charge generation layer consisting of 50 parts of β-type copper phthalocyanine (Dainippon Seika Co., Ltd.) and 50 parts of butyral resin (Kikusui Kagaku Co., Ltd., S-LEC BM-3), was placed on an aluminum support.
A charge transfer layer consisting of 50 parts (Anan Perfume) and 50 parts polycarbonate (Mitsubishi Kasei, Tubarex) was laminated to form a photoreceptor layer. Next, CTC236 was mixed with methyltrimethoxysilane, tetraethoxysilane, dimethylpolysiloxane with hydroxyl groups at both ends, and the acidic catalyst reaction mixture, and spray coating was performed to give a film thickness of 3 μm.
The photoreceptor 2 was prepared by holding it at 0° C. for 30 minutes and curing it to form a surface layer.

[Comparative Example 2] An electrophotographic photoreceptor was prepared in the same manner as in Example 2, except that CTC236 was not added when forming the surface layer.

This will be referred to as a photoreceptor 2'.

Further, a photoreceptor 2'' was prepared in the same manner as in Example 2 except that the surface layer was not formed.

Table 1 shows the results of using the photoreceptor of Example and repeating the electrophotographic process using a laser writing system 10,00 times to check whether there were any scratches on the surface of the photoreceptor. Furthermore, the amount of surface charge after one process is completed,
The average value obtained when the process was continuously performed 1000 times is shown.

According to this example, a photoreceptor with less residual charge after the completion of the -th process and improved printing durability was obtained.

The printing durability is improved by the first surface layer, and the residual surface potential is reduced by adding a charge transport substance to the surface layer.

〔Effect of the invention〕

In an electrophotographic photoreceptor comprising a conductive layer, a photoconductive layer, and a surface layer laminated on a support, the surface layer has a conductive substance or a charge transport substance dispersed in an organosilane thermosetting resin. By having such a structure, the rigidity resistance can be improved without causing the development of accumulation of residual charges, and this is highly effective in reducing the running cost of the photoreceptor and making it maintenance-free.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the structure of a photoreceptor in an embodiment of the present invention. 1...Support and conductor 2...Photoreceptor 3.Surface layer 4...Thermosetting resin 5...Conductive substance or charge transport material or more figure

Claims (1)

[Claims] In an electrophotographic photoreceptor comprising a conductive layer, a photoconductive layer, and a surface layer laminated on a support, the surface layer has a conductive substance or a charge transport substance dispersed in an organosilane thermosetting resin. A photoreceptor for electrophotography characterized by comprising a structure.